Continuity mistake: When Arthur is out hunting in the woods, Arthur is lying on a tree branch. In one shot, his pants leg is coloured brown, whereas, in the next shot, it is skin colour (as if he isn't wearing any pants). In the next shot, the brown pants leg has returned.
Continuity mistake: When Pelinore enters the castle, he takes the glove off his left hand. When he's passing Wart, however, his right hand is the one that is bare. Immediately afterwards the bare hand switches back to his left.
Trivia: In the two scenes where the wolf faces the tumbling rock Wart kicked loose (when he and Merlin depart for the castle), and where he is gnawed on by the squirrel girl, he bears exactly the same expression.